Current and efficiency of Brownian particles under oscillating forces in entropic barriers*
Nutku Ferhat†, Aydιner Ekrem‡
       
Plots of the one period of the entropic barrier (solid curve), coupled with the time-varying zero-mean modulated oscillating external force (dotted curve). Dashed curves show the amplitude variations. Total simulation time is selected as one period τ = 2 π . Panels (a) and (c) are for F ( t ) = A sin( t /2) sin(10 t ); panels (b) and (d) are for F ( t ) = A cos( t /2) cos(10 t ). Panels (a) and (b) show the phase shifts between the force and the barrier; panels (c) and (d) show the shifted barrier profiles.